update cosign version to v0.6.0

sigstore / k8s-manifest-sigstore

kubectl plugin for signing Kubernetes manifest YAML files with sigstore

Apache License 2.0

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Closed hirokuni-kitahara closed 3 years ago

hirokuni-kitahara commented 3 years ago

Signed-off-by: Hirokuni-Kitahara1 hirokuni.kitahara1@ibm.com

This PR is updating cosign version to v0.6.0, and update some related functions in the codes.